The girl i love takes me as a joke?

[sNYDER]

ok there is girl i really love and she knew it and i told her now she takes me as a joke me and her were best friends and then we went out she disrespected me and i let it go and now all she do is hang around boys and talks loud i know shes trying to get me jealous and i im ignoring her but she getting to me my friend said to get a girl in front of her and i will but wouldn't that make her do the same what should i do